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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec674d84d35492b8fd0542501fdd29b13069c1b6ec8be4178302454a1230041' 
  AND token = 'cmdo2kU3camn0GK1P8NCMwlQqe9sF4/UU8Vb6d8rxhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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