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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9263dfdd1f72f9b35a6673554fba920478b7035f0e916652e07042ac333e9cb7' 
  AND token = 'f3E90p7rGvK9zdGAbIVtD6zJDl81Z7+2f4MLTPmleko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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