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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb68962c84e39299de961e33fa1eed1d904cd0a3c92b7f68c8aaa2f07e576f3' 
  AND token = '9uxB32Or6nUPbIrYJ8KhBS7Elq0Tv0yf74M6wbrumLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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