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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '200a296614473fdb83a8e11b814dd6181a9be73b48ce9dacb9a9fe131d79670b' 
  AND token = 'NdXD729IKLWbGTNSYz6tj3j7bxH/7+UdKWvDyXwhiFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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