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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494b840cd730016d0633386fc842bbe0dcd2cb4ae9791950defeab71bde56009' 
  AND token = 'w14bGSieVGY4QZrMmx1SoY0IE/GWm92ucW/hVP/PxxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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