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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd1a69cb3cf484fc97104a1ba04ff670d7cd5b83170567dd0a9d6c1caf11b08' 
  AND token = 'TLdzldbKRJRAVroFPSHSvJGwlUx0z8OjGhXo78HpA94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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