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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce4c75027f04fef90f79a528d6dd296da3fbf004320a67494fe2e04b9a70eb3' 
  AND token = 'faAGJFzgATIWQy/j/kcLn/LTMi+913FKkwV8df9ZXEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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