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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b028da8cf7215052ef0c970c83afa32405862e32173d02182d5f6e14a13904' 
  AND token = '51f99RfbSMvjZ54LMyVpUnK0fkjLz+fHlkZHQ59MfkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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