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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce81870d783b0066dc59303496cfdcd658f629c2ea1138713208205b6d3cec6' 
  AND token = 'bC2ppuzbnivZKdYNze3YurroYOVExtU5AUN6BT1TB8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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