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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd053c107ee03348a379aed837368b181f5a75ad4448093aeeda34e1c365f0c8' 
  AND token = 'kA5tWB6/FdJ3tvk1V1ogPTe5hi/bRFt7hcySEppLqUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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