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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a5be034f78248b5cb98b5e7ea85dd13290aac3184bf5da011b1f4d1ec1600c' 
  AND token = '8YcrCjzSdHS+1ZtuFm/iywW9Yb+DPTAjoiFoA85a7u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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