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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9dc0501aab7dcf99777706cdef6ad5a67f55f794b2ae3f170d8ba2ce8a88be' 
  AND token = '7epHm7WkFygMs06GLcjDfJv47bd2lFo4tTM/VJ1X2tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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