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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689b7a268eed36ccc54c99cd33f9f8f304a1a3527fece2a28d435651cf86f481' 
  AND token = 'wEhCHdmhl42hNNqAFAbYjvRl8IzZvZbrmHN3fuxbn8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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