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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7801609c3197be67518a9baf98df6c03f2be829fa43c750863e8115f56f505c2' 
  AND token = 'hPyMX7Vfo7hE7OEvU/Nmg53nPVLDrKXU6tFjqVF3WX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}