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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a5bb908c6c8425b3e05284eb5a5f4031ac6b76c0d80fefcaeec55839fe028d' 
  AND token = '9bQynOuchy2yGVk2ymucQB5dbCEPj3N91e9cL11hHmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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