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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e082090945914a4d2c41692dc585e27e3242cac2dd101357fa68b60cd63116ae' 
  AND token = 'HW4UT1kF+zsu2seooMnoV32L2v8bP6GXX1JK49EtMOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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