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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87012e46a83bb1f92094ff254d1034bcc216f15c573356f236df3ecb44509ef8' 
  AND token = '1Io5cP49PBg0pTQfv8sAglzkF/HeI3Jxa2SsjlPnB+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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