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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7b3d71aab8ee012e9146d379c62eee77afc59ab2e8506ee85b73b75895958e' 
  AND token = '9YjOGi+7xKfgwFQZniF+Ywfzsjfrb8KM4UMlP65g6Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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