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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec116bea56b6de178234b16a2bb053acc54ef94448a779ab416f47d045e29f4' 
  AND token = 'es6Q4thaRR/0qEZaXesHgBwdSh/zDvF1h0vxCyEU6+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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