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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97cae7617edbed908fa7a086b6a9baa1ef4be6ebd0ac5e6b14fa72833342573d' 
  AND token = 'lI6ItBrrXfoRtASVQ1K+jvFElAbg14KZnyeRm23zIos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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