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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6551c766c9edcfd6d8b88900db75bbf75ea8ab45f37c9a4ce8ccd9b598a413eb' 
  AND token = 'xH4/djhSWj/C/c1dbcp/gyuSkocYf3s1E2g8DxT/RP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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