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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e885868afa656fd52070868d39d525d871e2a8766d2d9436e1c7a291189d7d' 
  AND token = 'ozJRL9ZN2W3YKiValCmcsJiU9Fw16b7UMg0pwvKLhoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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