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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c064bd9089b3a9728b5b4a6fe47098a85582bbce8d60f1d71a16082e9d5dce' 
  AND token = 'TaapuSXyDtXLuziQ7fZGQj+eKWNcRJOW7E7Za5BL2y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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