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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9016007743681c33375ba0482ccb4ad97a4b32c9b81d9c656d29b379a39a83c5' 
  AND token = 'blUwlIJRermOEMhB4CxpeH/6NdNKmhhjhtx2Mc9TJ/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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