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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9888b98e1d908809a4da3b3c78f19dcaeb75c8f10d360ce6364637b91f97825' 
  AND token = 'K/0TVjLx20AyLISSfV85mCiJjvZLd2keD8tFHaEv/sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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