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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f6a4f96ccf06b7bfba10de4dbe62e9f9b9512488fad87b786ee24b51aa0edf' 
  AND token = 'pPWdLcn4RslH8QjV+mTma4LNSFbtIj9C9wbDCDT6nzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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