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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea610c68c237a1b91fcdc9aa7e94e30fcc9feb325a253d5e14d614de4f85ba0' 
  AND token = '6+NJR7RiDSVOzl2jcV6f+rC6OE7ADxOFATDsZvVamGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00334

JSON explain

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