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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4423d0bc4b3fa5ea44ee8a79cc22f7e197af3920bda887c9a8713c999d5a2f84' 
  AND token = 'Sna9v3eDBbEHKk04xQ+WoDvRBeSwTvb9KqJA0XCsTnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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