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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71da7f3bab0927a1e4e28145f0d480065a60a7c9ecbcefb07ac73bc089ac7bb7' 
  AND token = '2bil2/PmYuRGXP7ovWZ5pj5jFV2Dnkrr3f10rpBxEBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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