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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071a61f271c889109e68cfedb81933b0aacf52eb216cae7a0c7115416d618b72' 
  AND token = 'eMwtgk1KB2KYXdUuGhy2gGlj9qwIWDs7K1jANfMuU/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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