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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68df87ceac8e0d70439755dbce1661abb3357d101d99a9e2eec1e288a34253d' 
  AND token = 'jWp9xN5Be/Ng05Q3Jzpvwell3j2262iLjz6y9EpfF/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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