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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e38bb612668120c092d453cbb82ce37ec9ed3b857ebd3b5f0c3345dbce39af' 
  AND token = 'PPN8PLVLh3w8G28DwHcFRmRNRW2CpGkhmbVVcc1T50c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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