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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39b5d9b8a4b533f939b5e9b10f6861f1ca0e7f7a47c2dc45cfe7283e9c21525' 
  AND token = 'OnEs9z3sWiMqTbCRLltp0P3vABt5qAqhc6OD6dHRzjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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