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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0696251e6bbe3cf2852642fcb5ede066bca8f59a8d1b18f6f68c86c6a79f7b' 
  AND token = 'bbJqktykRfmhID/JvaiUS4nTNMKc6Hv7mH/1aVdKVWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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