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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dfbf7321e15c2ed46a7e71237ece149f99cd7b9af1c3f0594b01092f07df3e' 
  AND token = 'sGwp33QAiV78yH+S3c7LCi9JdltspwVFCABrvnNUj0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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