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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a71f672b8bf67dfb9ebd2bef3158e0635408acd93c152d3cfdda8fefe8e4824' 
  AND token = 'DhiPZRIbuOOZIPZgxWmvL73pUyFpG2092j1DEq4PwsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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