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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c02dde857338cb452b3c8dfc4e405e2de6fdf2aa02890ce4fee6bac4c589342' 
  AND token = 'YkIXE8jEY+VtILRlM1tnAPuDMNY06NUXohGZjsXsGh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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