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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f7ffaa314ae4fc618186068884c321602b1b438990f4a564506a28a411181a' 
  AND token = '02oGe0Z1NMY94V2EMwUcpOpnqEuaxAvi7b9PCMP7h28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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