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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7268a36076e6b71647ccf8818ec2503d2a547952e729aeb42237b7c5799b85' 
  AND token = '2uHojmVTSUsHNjQ6xzX+qXOwdx4smM4MXbOW5u4Kf2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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