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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ae104660e0d70d62a750993027316f1226d70681c593b032b6afb6984839bd' 
  AND token = '7PP5+aiHLQb6iXZRjWa0DFPZGSkQcYIydk2JdacIsx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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