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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7c924c844b4c6fd6bae10d1262c9ddd666a5839a94f0960e5ac693413bbdff' 
  AND token = '1HsiYE0Aml3tGN/4N0GOhuWM7VXml1MLH3769tNn2gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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