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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b2c25f11150ddd8c2d138c6b7beede187024d706528c37943ce0b4b7acc329' 
  AND token = 'dCnuvwN3QeUkBOnQfMdCin9ZjZd+lh8ZA6DUy50Z3vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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