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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ad47fa73492d0383537e0bebd5905ac41b4419023347cd47d7d305c0e204b5' 
  AND token = 'knWfVflzM1hMsCnAMTY5nwuUybp8evBkoZMCRKnW5RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00294

JSON explain

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