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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98405a15ee15fb8ea1658fc12736507c5686d8fcb2352d9e4a25e65235d43b8d' 
  AND token = 'fYVmMEOkVfvd5k4FzHFtRq0d0FQabp0xMDd4l/G1Kgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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