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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b48e82dffa24027c64fb2b33234256ead6a3ab5e15d4b24eb1871f1e76fa4a' 
  AND token = 'zgp4IsgQ0SCyebEJZYvofJ9y1fMUHSnP5MD/ThNs5sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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