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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c89367f2d2091d8e47e5f0b4a84ceb6bb04836dc3ec423a030d4cbc6116e8d' 
  AND token = 'F34OyHqjDz1L7oKV/lgLzH5KmBYYgyejergHPj4e0Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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