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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905ed7932c258942dfe8414c60d68f38abbbc4d3071d0d8956ce25b0ea44d9dc' 
  AND token = 'tDLUO79iqjtcxgPlb9zWj+ao8yHCrY18BmISBLeqCio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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