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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e531a8d101103fb4ea9895b163aab8b3c6fa537221423b5233df845a614cb2e4' 
  AND token = 'htU7KSmwyf0iVQFt4ReL3oTXAvxFPLSNeIU0yK+GmsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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