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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95f8f24f67a120f50b50d91893e50f5baa6231569b299c950ed291a8af84cfb' 
  AND token = 'QwQWwa7u/c4oncUld76EVnxAnhVL90eD30KdfG62BnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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