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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b9120c7cf1a4f5624539f10764101cbc170d959600779c4376541119dc4a26' 
  AND token = 'kPj6/+kuhjp/HiB8DFXQrcA/I65ainXQUOrc5OFuUKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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