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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66de5957ee7031c9a3a68de58225af1e31dfd15d92c6c01d046a922332a1a807' 
  AND token = 'B4AzVC1zYM4IQNOepNKWZLh4L1QwKK74Pcw+CehsUi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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