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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee554ddcd34bbf98f2ff7cef9252e371e66037b2ce1eba55e4b6c398f836dff9' 
  AND token = 'TiXZneqK6N/2rEEgFNM/Rk4sdD84LyQEGT8vdwBWQJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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