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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1f9c65d9b16f4dbe0a51f6d508bb2d74c36f5316290161fb1acb73b618b906' 
  AND token = '0Udo4t5pvBaRXBx7viR/XdlgBMHDJeQeib93JDQ9lOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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