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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b992a81e99dc34781f9b9ed693940cfc38ab69745e70f04146970dd7af8b9f' 
  AND token = 'kwMyt9bkIKQ8/Tf9Rd25YqVqcfequnDPdiyLJEJn0LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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