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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8099209b39461df9190a9cff15b75db5514acaf2e8b2a50f107ef383988161cd' 
  AND token = 'jvdmFkmZZ939LeCv/48+QiR/b+tAYx+UL0ErX1vjaiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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