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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52dd2f13b53add0320e43a3449963bddb6a6f116c479a432fcc509cc4904e7b1' 
  AND token = 'WtwhMWbwA46AqXk7/O/1RAx+QCQYRqT2txQ3NN8ImkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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