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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6ba760b1b3b74403c677a0cdaf1c16465e7c828ffc7008d2fc396410f03e6e' 
  AND token = '90aJlEdZbzcDYCUyoa+2b7tbATZN4Hwoz5xpezM85u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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