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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58c2d16bdf1f49843868f1a32b5eb50c112e59009a491d872cfb7290bae79c3' 
  AND token = 'jVjD3pIAAHj8t1R0Kkj/6N3WqUu7MFaiTrk5kjJz1kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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