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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884009be662555e3b7f5e3c8d78ce8b3951ca6ba6008043138be6d717ae76e97' 
  AND token = '/B4tJLZuAM4KtXXoc1HvmDTyQhqIP9fILT1wNfMr4zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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