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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c9a8c90359cb103a6fbfec98d851d41665580581b5d88173dd88cb2c0f1987' 
  AND token = 'ajlz7AHgeTvaEzN8pxxukzqC3txwNL9ZvdnmqyLeggc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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