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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd4d6b80ed60689b3f99931b7a5186533ffbd9c55ac08283e14f4ac5c9dbda2' 
  AND token = '6lQuphTt2UGzNcur8xIsJi/HY9aigTy/AKpp3Ye5Als=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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