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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9f734cbd99005a7940d359ac34ae4a66b194949b8cfcaa9c9f7437c531604e' 
  AND token = 'mC9XM6T+tweJgRnvZxbIBHa5K4PCJaioUegEa4mPHDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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