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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68fc0eee5f6e0fb31a16bfdf5bbf0ec17350983cf60c72b4eea2f8b2367eee8f' 
  AND token = 'Yz9QVV/0U06Fqw42I2EeIcTpxTzfgnWM0r6S0Pdh6v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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