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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd39d9599e6c61fc7c46b3d9fe7967249e3bca6ecce47523fee1e131856782d' 
  AND token = '9AEpAtUv++T9IofwJkLY+i8l+jv4ywdcdJa13ts1A/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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