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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf9d98f3af6cdde44a938ee8c442283fbdcef9c62522d34b9e062dedf0609aa' 
  AND token = 'ORayTfjN/plZb4XYjxgarzZOo+D0jC9JeEvNIAQ2znM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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